[Micho]

This algae usually appears when CO2 and nutrient levels are very low, and light is excessive. Remove as much as possible using a toothbrush and a narrow siphon hose. Then increase CO2 and nutrient levels.

Water changes won't do much tbh, if anything it'll make it worst because you're removing more nutrients from the water.

 

[Micho]

Manually removing algae works best for the non-persistent algae, blue green algae and black beard algae usually require more drastic measure like hydrogen peroxide/Excel spot treatment.

Hair algae is easy to remove, just take a clean toothbrush and swirl it around, you should grab the majority of it.

Also the CO2 & nutrient thing is just to prevent the algae from coming back, limiting your photoperiod would also help but manually removing algae always seem to work best for me IME. It's how I got rid of my BBA.